5 Gallon Converted Igloo Cooler Mash Tun with False BottomConverted 5 Gallon igloo cooler mash Tun with Stainless Steel false bottom, Stainless tube to ball valve. The converted igloo makes all grain brewing a breeze.First time with a cooler? Check out some quick instructions or helpful assembly pictures Learn about sealing National Pipe Thread (NPT) fittings.